I have an Autometer trans temp gauge.

The sender on this thing is freakin HUGE, anyone have any damn Ideas where to put this thin or how to rig it up?

 

Cut the top line on the cooler at the rad. Install it there.

 

It cost me about $30 in fittings to hook mine up. I do not recomend you drill a hole in the trans pan. I assume that you have a trans cooler though. I installed a manifold (its a brass "T" looking thing) where the hose comes out of the cooler and goes into the return line of the trans. The sender is on the top, while the fluid lines are on the side. Remember to use thread tape though, or you will have a nice pool of fluid. As far as it being huge, who makes it? Did you get the right one? I had to get an adaptor because mine was too small for the manifold.